JPWO2019012640A1 - Hand dryer - Google Patents

Abstract

In the hand dryer, it prevents false detection due to water droplets adhering to the wall surface of the hand insertion part. From the housing 2 provided with the nozzle 5 that ejects the air flow toward the hand insertion portion 3 where the hand can be placed, the high-pressure air flow generator 4, the first detection electrode 6, and the first detection electrode 6 Also, a water determination for determining the presence or absence of water droplets on the wall surface of the hand insertion portion 3 based on the second detection electrode 7 provided at a position close to the hand insertion portion 3 and the detection value at the second detection electrode 7 Unit 21, a hand determination unit 22 that determines presence / absence of a hand in hand insertion unit 3 based on a detection value in first detection electrode 6 and a determination result in water determination unit 21, and hand determination unit 22 And an operation control unit 23 that controls the operation of the high-pressure airflow generator 4 based on the determination result.

Description

  The present invention relates to a hand dryer for drying wet hands after washing.

  As a conventional hand drying device, there is one provided with a capacitance type hand detection sensor for detecting insertion of a hand into a hand insertion portion (for example, Patent Document 1). In this hand-drying device, by providing a conductive detection electrode, the change in capacitance due to the moisture contained in the hand, that is, the moisture inside and on the surface of the hand was detected, and insertion of the hand was detected. .

Japanese Patent No. 5897225

  When a drying operation is performed using a hand dryer, a phenomenon occurs in which water droplets adhering to the surface of the hand scatter and adhere to the wall surface of the hand insertion portion. The capacitance type sensor does not detect only the moisture contained in the hand inserted into the hand insertion part, but also detects water droplets attached to the wall surface of the hand insertion part. Therefore, even after the user pulls out his hand, there is a problem in that it is erroneously detected that the hand is inserted due to the influence of water droplets attached to the wall surface of the hand insertion portion, and the operation is continued.

  The present invention is for solving the above-described problems, and an object thereof is to prevent erroneous detection due to water droplets adhering to the wall surface of a manual insertion portion.

  A hand drying device according to the present invention includes a housing including a nozzle that ejects an air flow toward a drying processing space in which a hand can be placed, and an air flow that is provided in the housing and generates an air flow ejected from the nozzle. A generator, a first detection electrode provided in the casing, a second detection electrode provided in the casing and closer to the drying processing space than the first detection electrode, and a second Based on the detection value at the detection electrode, a water determination unit that determines the presence or absence of water droplets on the surface of the housing that contacts the drying treatment space, the detection value at the first detection electrode, and the determination result at the water determination unit The hand determination unit that determines the presence or absence of a hand in the drying processing space, and the operation control unit that controls the operation of the air flow generation unit based on the determination result of the hand determination unit.

  According to the hand drying device of the present invention, it is possible to prevent erroneous detection due to water droplets adhering to the wall surface of the hand insertion portion.

1 is a perspective view of a hand dryer according to Embodiment 1. FIG. It is side surface sectional drawing of the hand-drying apparatus which concerns on Embodiment 1. FIG. FIG. 3 is a block diagram illustrating a configuration of a control unit of the hand dryer according to the first embodiment. FIG. 4 is a flowchart showing an operation of a control unit of the hand dryer according to the first embodiment. It is a figure which shows the change of the electrostatic capacitance of the hand dryer which concerns on Embodiment 1. FIG. It is a figure which shows the change of the electrostatic capacitance of the hand dryer which concerns on Embodiment 1. FIG. It is a flowchart figure which shows operation | movement of the control part of the hand dryer which concerns on Embodiment 2. FIG. It is a figure which shows the change of the electrostatic capacitance of the hand dryer which concerns on Embodiment 2. FIG.

Embodiment 1 FIG.
First, the structure of the hand-drying apparatus of Embodiment 1 is demonstrated using FIG.1 and FIG.2. FIG. 1 is a perspective view of the hand dryer according to the first embodiment, and FIG. 2 is a side sectional view of the hand dryer according to the first embodiment. For convenience of explanation, in the hand dryer shown in FIG. 2, the upper direction on the page is defined as the upper direction, the lower direction on the page is defined as the lower direction, the left direction on the page is defined as the front direction, the right direction on the page is defined as the rear direction. To do.

  1 and 2, a housing 2 that forms an outer shell of the hand drying device 1 has a hand insertion portion 3 that is a drying processing space in which a user can place a hand at a lower portion.

  Inside the housing 2, a high-pressure airflow generator 4 that is an airflow generator that generates a high-pressure airflow and a high-pressure airflow generated by the high-pressure airflow generator 4 are ejected toward the manual insertion portion 3. From the nozzle 5, the conductive first detection electrode 6 and the second detection electrode 7 that detect a change in capacitance in the manual insertion portion 3, and the first detection electrode 6 and the second detection electrode 7. And a control unit 8 for controlling the operation of the high-pressure airflow generator 4 based on the above information.

  Further, the housing 2 has an internal intake port 9 that is provided above the manual insertion portion 3 and provided on the front surface of the housing 2, and an internal intake air that communicates the intake side of the high-pressure airflow generator 4 with the internal intake port 9. A passage 10 and an exhaust passage 11 that connects the exhaust side of the high-pressure airflow generator 4 and the nozzle 5 are formed. In the middle of the exhaust passage 11, there is provided an electric heater 12 that heats the high-pressure air flow generated by the high-pressure air flow generator 4 to warm it. A front panel 13 that is an outer shell of the hand drying device 1 and that can be attached to and detached from the housing 2 is attached to the front surface of the housing 2 above the hand insertion portion 3. A gap is formed between the front panel 13 and the housing 2, and this space serves as an external air inlet 14.

  The manual insertion portion 3 is a space surrounded by the upper wall 3a on the upper side, the rear wall 3b on the rear side, and the bottom wall 3c on the lower side. On the rear side of the manual insertion portion 3, both side surfaces in the left-right direction are surrounded by side walls 3d and 3e. Both side surfaces on the front side of the hand insertion portion 3 are open, and the user can insert and remove the hand from the front direction and the left-right direction of the hand insertion portion 3.

  The upper wall 3a, the rear wall 3b, the bottom wall 3c, the side wall 3d, and the side wall 3e are formed of a resin impregnated with an antibacterial agent, and the surface thereof is a water-repellent coating such as silicon-based or fluorine-based, or A hydrophilic coating such as titanium oxide is applied. Thereby, while suppressing that a dirt adheres to the surface of hand insertion part 3, propagation of various germs can be reduced.

  The upper wall 3a is provided with a nozzle 5 that ejects a high-pressure air flow downward toward the bottom wall 3c. The nozzle 5 is a plurality of opening holes arranged in a straight line in the left-right direction. The nozzle 5 is formed so as to be inclined by 10 ° from the vertical direction toward the rear wall 3b, so that the jetted air is not blown to the user.

  The bottom wall 3c is provided with a barrier structure by rising of a curved surface structure at an end edge portion thereof so that water does not scatter to the side and the front. The bottom portion of the bottom wall 4c is an inclined surface inclined forward, and a drain port (not shown) is provided at the lower end of the inclined surface. Below the bottom wall 4c, a drainage tank 15 for storing water dripping from the drainage port is detachably provided.

  The first detection electrode 6 and the second detection electrode 7 are electrodes for detecting the electrostatic capacitance in the hand insertion portion 3, respectively, and are electrostatic charges caused by water contained in the inserted hand and water droplets attached to the wall surface. Detect changes in capacity.

  The first detection electrode 6 and the second detection electrode 7 are disposed on the back side of the upper wall 3a of the hand insertion portion 3, respectively. The 2nd detection electrode 7 is arrange | positioned in the state which contacted the surface of the back side of the upper wall 3a, and the 1st detection electrode 6 is arrange | positioned in the position away from the upper wall 3a. By arranging in this way, when a water droplet adheres to the upper wall 3a, the capacitance value detected by the second detection electrode 7 is the capacitance value detected by the first detection electrode 6. Since it becomes larger than a value, it can be judged that the water droplet adhered to the upper wall 3a.

  It should be noted that when a water droplet adheres to the upper wall 3a, the capacitance value detected by the second detection electrode 7 should be larger than the capacitance value detected by the first detection electrode 6. Therefore, the second detection electrode 7 may be disposed so as to be closer to the upper wall 3a than the first detection electrode 6, and is not necessarily in contact with the back surface of the upper wall 3a.

  Next, the configuration of the control unit 8 will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of a control unit of the hand dryer according to the first embodiment.

  In FIG. 3, the control unit 8 includes a water determination unit 21, a hand determination unit 22, and an operation control unit 23.

  The water determination unit 21 determines whether water droplets are attached to the wall surface of the manual insertion unit 3 based on the detection value at the second detection electrode 7. Then, the water determination unit 21 outputs a determination result of whether or not water droplets are attached to the hand determination unit 22.

  The hand determination unit 22 determines the presence or absence of a hand in the hand insertion unit 3 based on the detection value at the first detection electrode 6 and the determination result at the water determination unit 21. Then, the hand determination unit 22 outputs the determination result of the presence / absence of a hand to the operation control unit 23.

  The operation control unit 23 controls the operation of the high-pressure airflow generator 4 based on the determination result in the hand determination unit 22.

  Next, the flow of air when the hand dryer 1 is operated will be described with reference to FIG.

  When the user puts a wet hand into the hand insertion unit 3, the high-pressure airflow generator 4 is activated by the processing of the control unit 8. When the high-pressure airflow generator 4 is activated, air outside the hand dryer 1 is sucked into the housing 2 from the external air inlet 14. The sucked air passes through the internal intake port 9 and the internal intake passage 10 and is sucked into the high-pressure airflow generator 4. The high-pressure airflow generator 4 converts the sucked air into a high-pressure airflow and exhausts it toward the exhaust passage 11. The exhausted high-pressure airflow is heated by the electric heater 12 in the exhaust passage 11, is converted into a high-speed airflow by the nozzle 5, and is ejected downward toward the bottom wall 3c. The high-speed airflow ejected from the nozzle 5 hits a wet hand inserted in the hand insertion portion 3 and blows off water droplets adhering to the surface of the hand.

  Next, the operation of the control unit 8 will be described with reference to FIG. FIG. 4 is a flowchart illustrating the operation of the control unit of the hand dryer according to the first embodiment.

  When the power of the hand dryer 1 is turned on, the control flow starts from the start time.

  In S1, the water determination part 21 compares the detection value in the 2nd detection electrode 7, and a 1st threshold value. The first threshold value is a threshold value for determining whether or not water droplets adhere to the wall surface of the manual insertion portion 3, and is a capacitance value that exceeds only when water droplets adhere. In S1, when the detection value at the second detection electrode 7 is less than the first threshold value, the water determination unit 21 determines “no water adhesion” and proceeds to S2.

  In S <b> 2, the hand determination unit 22 compares the detection value at the first detection electrode 6 with the second threshold value. The second threshold value is a threshold value for determining the presence / absence of a hand in the hand insertion unit 3 and is a capacitance value that exceeds when a hand is inserted into the hand insertion unit 3. If the detection value at the first detection electrode 6 is less than the second threshold value in S2, the hand determination unit 22 determines that there is no hand and returns to S1. If the detection value at the first detection electrode 6 is equal to or greater than the second threshold value in S2, the hand determination unit 22 determines that “there is a hand” and proceeds to S3.

  In S3, the operation control unit 23 activates the high-pressure airflow generator 4.

  In S1, when the detection value at the second detection electrode 7 is equal to or greater than the first threshold value, the water determination unit 21 determines that “water adheres” and proceeds to S4.

  In S4, the hand determination unit 22 uses the third threshold value as a threshold value for determining the presence / absence of the hand, and compares the detection value at the first detection electrode 6 with the third threshold value. The third threshold value is a value obtained by adding a preset value of the influence due to adhesion of water droplets to the second threshold value. In S4, when the detection value at the first detection electrode 6 is less than the third threshold value, the hand determination unit 22 determines “no hand” and returns to S1. In S4, when the detection value at the first detection electrode 6 becomes equal to or greater than the third threshold value, the hand determination unit 22 determines that “there is a hand” and proceeds to S3.

  In S3, when the operation control unit 23 starts the high-pressure airflow generator 4, the process proceeds to S5.

  In S5, the water determination unit 21 compares the detection value at the second detection electrode 7 with the first threshold value. In S5, when the detection value at the second detection electrode 7 is less than the first threshold value, the water determination unit 21 determines “no water adhesion”, and the process proceeds to S6.

  In S6, the hand determination unit 22 compares the detection value at the first detection electrode 6 with the second threshold value. In S6, when the detection value at the first detection electrode 6 is equal to or greater than the second threshold, the hand determination unit 22 determines that “there is a hand” and returns to S5. In S6, when the detection value at the first detection electrode 6 is less than the second threshold value, the hand determination unit 22 determines that there is no hand, and the process proceeds to S7.

  In S7, the operation control unit 23 stops the high-pressure airflow generator 4.

  In S5, when the detection value at the second detection electrode 7 is equal to or greater than the first threshold value, the water determination unit 21 determines that “there is water adhesion” and proceeds to S8.

  In S8, the hand determination unit 22 uses the third threshold value as a threshold value for determining the presence / absence of a hand, and compares the detection value at the first detection electrode 6 with the third threshold value. In S8, when the detection value at the first detection electrode 6 is equal to or greater than the third threshold value, the hand determination unit 22 determines that “there is a hand” and returns to S5. In S8, when the detection value at the first detection electrode 6 becomes less than the third threshold, the hand determination unit 22 determines that there is no hand, and the process proceeds to S7.

  In S7, when the operation control unit 23 stops the high-pressure airflow generator 4, the operation is completed. After the end, the control flow starts again from the start time.

  Next, the operation of the control unit 8 will be specifically described with reference to FIGS. 5 and 6. 5 and 6 are diagrams showing changes in capacitance of the hand dryer according to the first embodiment. FIG. 5 shows a change in electrostatic capacitance when no water droplet adheres to the upper wall 3a, and FIG. 6 shows a change in electrostatic capacitance when a water droplet adheres to the upper wall 3a.

  In FIGS. 5 and 6, the horizontal axis indicates elapsed time, during operation standby (section a), manual insertion operation (section b), dry processing after manual insertion (section c), and manual extraction operation (section d). ) And data fluctuation at the time of operation standby (section e) after manual sampling. The vertical axis represents the capacitance value, T1 represents the first threshold, T2 represents the second threshold, and T3 represents the third threshold. Line A indicates a change in threshold value for determining “with water”, and line B indicates a change in threshold value for determining with “hand”. Variations in the capacitance data detected by the first detection electrode 6 are indicated by a solid line, and variations in the capacitance data detected by the second detection electrode 7 are indicated by a broken line.

  First, with reference to FIG. 5, a description will be given of a change in capacitance when no water droplets adhere to the upper wall 3a. At the time of operation standby in the section a, the capacitance values detected by the first detection electrode 6 and the second detection electrode 7 are low and stable. When the user inserts his / her hand into the hand insertion portion 3 in the interval b, the value of the capacitance detected by the first detection electrode 6 greatly increases and exceeds the line B. When the line B is exceeded, the hand determination unit 22 determines that “hand is present”, and the operation control unit 23 starts the high-pressure airflow generator 4.

  When no water droplet adheres to the upper wall 3a, the second detection electrode 7 also detects only the capacitance due to the moisture contained in the user's hand, and thus a value exceeding the line A is not detected. Therefore, the water determination unit 21 determines “no water adhesion”.

  In the section d, when the user pulls out his hand, the detection value at the first detection electrode 6 falls below the line B and returns to the same numerical value as before the start of operation (section e). Therefore, after the hand is extracted, the hand determination unit 22 determines that there is no hand, and the operation control unit 23 stops the high-pressure airflow generator 4 without any problem.

  Next, a change in capacitance when water droplets adhere to the upper wall 3a will be described with reference to FIG. From the standby time (section a) to the manual insertion operation (section b), the change is the same as in FIG.

  When the user performs the hand drying process in the section c, water droplets scattered from the user's hand adhere to the upper wall 3a. When a water droplet adheres to the upper wall 3a, the first detection electrode 6 continues to detect the capacitance of the water droplet adhering to the upper wall 3a even if the user pulls out the hand in the section d. It becomes a value larger than the threshold value. Therefore, if the hand determination unit 22 performs the determination with the second threshold even after the water droplet is attached, it is determined that there is a hand even after the hand is pulled out, and the operation control unit 23 determines that the high-pressure airflow generator 4 Driving will continue. Therefore, the hand determination unit 22 according to the first embodiment uses a third threshold value instead of the second threshold value as a threshold value for determining the presence / absence of a hand when a water droplet adheres.

  If a water droplet adheres to the upper wall 3a in the section c, the detection value at the second detection electrode 7 that is close to the water droplet becomes very large and exceeds the line A. When the line A is exceeded, the water determination unit 21 determines that “there is water adhesion” and outputs the determination result to the hand determination unit 22. And the hand determination part 22 determines the presence or absence of a hand using a 3rd threshold value. As a result, when the user pulls out the hand in the section d, the detection value at the first detection electrode 6 falls below the line B, so that the hand determination unit 22 determines “no hand” and the operation control unit 23 determines the high pressure. The air flow generator 4 stops without any problem.

  According to the hand drying device of the first embodiment, by changing the threshold value used for determining the presence / absence of a hand depending on whether water droplets adhere to the wall surface of the hand insertion unit 3 or not. It is possible to prevent erroneous detection due to water droplets adhering to the wall surface of the insertion portion 3, and the operation can be stopped without any problem after the user removes his / her hand.

  In the first embodiment, as the third threshold value, a value obtained by adding a preset value of the influence due to the adhesion of water droplets is used as the second threshold value. It is not necessary to set a fixed value. For example, the detection value at the first detection electrode 6, the detection value at the second detection electrode 7, and the attachment of water droplets according to the detection values at the first detection electrode 6 and the second detection electrode 7. A numerical value table storing the values of the influences in association with each other is provided, and the detection value at the first detection electrode 6 and the detection value at the second detection electrode 7 are collated with the above numerical value table, and the adhesion of water drops The value of the influence due to may be reset each time. By doing so, since the third threshold value can be changed according to the amount of water droplets attached, it is possible to improve the accuracy of preventing erroneous detection due to water droplets attached.

Embodiment 2. FIG.
In the hand drying device according to the first embodiment, when the water determination unit 21 determines that “water adheres”, the hand determination unit 22 determines the presence / absence of a hand using the third threshold value. It was. On the other hand, in the hand drying device of the second embodiment, when the water determination unit 21 determines that “water is attached”, the hand determination unit 22 calculates the offset value from the detection value at the first detection electrode 6. A subtraction process is performed, and the presence / absence of a hand is determined by comparing the subtracted detection value with the second threshold value. Here, the offset value is a value of deviation caused by the influence of water droplets attached to the wall surface of the hand insertion portion 3 from the capacitance value that should be detected only by the moisture contained in the hand. The offset value is set in advance to the value of the influence due to the adhesion of water droplets.

  Since the configuration other than the hand determination unit 22 of the hand drying device of the second embodiment is the same as that of the first embodiment, the description thereof is omitted.

  Next, operation | movement of the control part 8 of the hand dryer which concerns on Embodiment 2 is demonstrated using FIG. FIG. 7 is a flowchart showing the operation of the control unit of the hand dryer according to the second embodiment.

  In FIG. 7, the operations in S4 and S8 are different from those in the first embodiment. In S4, the hand determination unit 22 compares the value obtained by subtracting the offset value from the detection value at the first detection electrode 6 with the second threshold value. In S4, when the detection value after the subtraction is less than the second threshold value, the hand determination unit 22 determines “no hand” and returns to S1. In S4, when the detection value after the subtraction is equal to or greater than the second threshold value, the hand determination unit 22 determines that “there is a hand” and proceeds to S3.

  In S <b> 8, the hand determination unit 22 compares the value obtained by subtracting the offset value from the detection value at the first detection electrode 6 with the second threshold value. In S8, when the detection value after the subtraction is equal to or greater than the second threshold, the hand determination unit 22 determines that “there is a hand” and returns to S5. In S8, when the detection value after the subtraction is less than the second threshold, the hand determination unit 22 determines “no hand”, and the process proceeds to S7.

  Since operations other than S4 and S8 are the same as those in the first embodiment, description thereof is omitted.

  Next, the operation of the control unit 8 will be specifically described with reference to FIG. FIG. 8 is a diagram showing a change in capacitance of the hand dryer according to the second embodiment, and shows a change in capacitance when water droplets adhere to the upper wall 3a.

  In FIG. 8, when the water determination unit 21 determines that “water is attached” in the section c, the hand determination unit 22 performs a process of subtracting the offset value from the detection value at the first detection electrode 6. In FIG. 8, the long broken line branched from the solid line is the detection value at the first detection electrode 6 after the offset value is subtracted. When the hand is extracted in the section d, the subtracted detection value falls below the line B, and the hand determination unit 22 determines “no hand”, so the operation control unit 23 stops the high-pressure airflow generator 4 without any problem. .

  According to the hand drying device of the second embodiment, when a water droplet adheres to the wall surface of the hand insertion unit 3, the offset value is subtracted from the detection value at the first detection electrode 6, and the detection after the subtraction is performed. Since the value and the set threshold value are compared, erroneous detection due to water droplets adhering to the wall surface of the hand insertion portion 3 can be prevented, and the operation can be stopped without any problem after the user removes the hand. can do.

  In the second embodiment, the preset value of the influence due to the adhesion of water droplets is used as the offset value. However, the value of the influence due to the adhesion of water droplets may not be set to a predetermined constant value. For example, the detection value at the first detection electrode 6, the detection value at the second detection electrode 7, and the attachment of water droplets according to the detection values at the first detection electrode 6 and the second detection electrode 7. A numerical value table storing the values of the influences in association with each other is provided, and the detection value at the first detection electrode 6 and the detection value at the second detection electrode 7 are collated with the above numerical value table, and the adhesion of water drops The value of the influence due to may be reset each time. By doing so, the offset value can be changed in accordance with the amount of water droplets attached, so that it is possible to improve the accuracy of preventing erroneous detection due to the water droplets attached.

  In the first and second embodiments, the water determination unit 21 and the hand determination unit 22 are provided in the control unit 8, but the water determination unit 21 and the hand determination unit 22 may be provided separately from the control unit 8. For example, the water determination unit 21 is provided close to the second detection electrode 7, the hand determination unit 22 is provided close to the first detection electrode 6, and the determination result of the hand determination unit 22 is transmitted to the control unit 8. It is good also as a structure which outputs to.

  Moreover, in Embodiment 1 and 2, although the hand insertion part which is the space which covers a user's hand is arrange | positioned toward the front, it is set as the hand dryer which ejects a high-speed airflow from the direction near perpendicular | vertical, but it is not restricted to this. Alternatively, a hand drying device that opens upward and ejects a high-speed air stream from a direction close to the horizontal, or a hand drying device that does not form a hand insertion portion and opens the lower portion from the nozzle as a drying processing space may be used.

  In addition, there are two types of capacitance sensors, which are broadly referred to as a self-capacitance type and a mutual capacitance type, and the same applies to both the first detection electrode and the second detection electrode. The effect of can be obtained.

  The hand dryer according to the present invention can be widely used as a hand dryer for home use or business use.

DESCRIPTION OF SYMBOLS 1 Hand dryer, 2 Housing | casing, 3 Hand insertion part, 4 High-pressure airflow generator, 5 Nozzle, 6 1st detection electrode, 7 2nd detection electrode, 8 Control part, 9 Internal air inlet, 10 Internal air intake Passage, 11 exhaust passage, 12 electric heater, 13 front panel, 14 external intake port, 15 drainage tank, 21 water judgment section, 22 hand judgment section, 23 operation control section.

A hand drying device according to the present invention includes a housing provided with a nozzle that ejects an air flow toward a drying processing space in which hands can be placed, and an air flow that is provided in the housing and generates an air flow ejected from the nozzle. A generator, a first detection electrode provided in the housing and detecting capacitance in the drying processing space; and provided in the housing; provided in a position closer to the drying processing space than the first detection electrode ; A second detection electrode for detecting capacitance in the drying processing space; and an operation control unit for controlling the operation of the air flow generation unit based on the detection values of the first detection electrode and the second detection electrode . Is.

Claims (8)

A housing having a nozzle for ejecting an air flow toward a drying treatment space where hands can be placed;
An air flow generator provided in the housing and generating an air flow ejected from the nozzle;
A first detection electrode provided in the housing;
A second detection electrode provided in the housing and provided closer to the drying treatment space than the first detection electrode;
A water determination unit that determines the presence or absence of water droplets on the surface of the housing in contact with the drying treatment space based on the detection value at the second detection electrode;
Based on the detection value at the first detection electrode and the determination result at the water determination unit, a hand determination unit that determines the presence or absence of a hand in the drying treatment space;
A hand drying device comprising: an operation control unit that controls an operation of the air flow generation unit based on a determination result in the hand determination unit.   The water determination unit compares the first threshold value with the detection value at the second detection electrode, and determines whether or not water droplets adhere to the surface of the casing that contacts the drying treatment space. The hand dryer according to claim 1.   The hand determination unit determines the presence or absence of a hand in the drying processing space by comparing a second threshold value that is a threshold value smaller than the first threshold value and a detection value at the first detection electrode. The hand-drying apparatus according to claim 2, wherein: The hand determination unit
When the water determination unit determines that water droplets are attached, a third threshold value that is a threshold value that is larger than the second threshold value and that is smaller than the first threshold value; The hand drying apparatus according to claim 3, wherein presence / absence of a hand in the drying processing space is determined by comparing with a detection value at the first detection electrode.   The said hand determination part determines a said 3rd threshold value based on the detection value in a said 1st detection electrode, and the detection value in a said 2nd detection electrode, The said 3rd threshold value is characterized by the above-mentioned. Hand drying equipment. The hand determination unit
When the water determination unit determines that water droplets are attached, an offset value is subtracted from the detection value at the first detection electrode, and the first detection electrode is subtracted from the second threshold value. The hand-drying device according to claim 3, wherein the presence / absence of a hand in the drying processing space is determined by comparing the detected value with the detected value.   The hand according to claim 6, wherein the hand determination unit determines the offset value based on a detection value at the first detection electrode and a detection value at the second detection electrode. Drying equipment.   The hand-drying device according to any one of claims 1 to 7, wherein the second detection electrode is in contact with a surface on the back side of a surface of the housing that is in contact with the drying processing space.

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